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Measurement of critical heat flux conditions under vacuum

Lenka Nemsilová, Pavol Timár Jr., Pavel Timár, Ján Stopka, Ladislav Štibrányi, and Vladimír Báleš

Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37, Bratislava, Slovakia



Abstract: Determination of optimum conditions for waste oil (used motor oils, transformer oils) regeneration using vacuum distillation was attempted including the search for the optimum temperature difference between the heating surface and the boiling point of the liquid. Optimum temperature allowed the distillation equipment to operate at maximum performance. Equipment suitable for the measurement of boiling curves under atmospheric pressure and vacuum conditions was assembled. These curves were used to determine the optimum temperature difference of various substances including waste oils. Properties of pure substances, for example water, ethanol, hexane, heptane, isooctane, decane, or dodecane, were measured with this equipment under atmospheric pressure. Results of various liquids measurements under vacuum and atmospheric pressure are presented.

Keywords: waste oils – boiling curve – boiling regime – optimum temperature

Full paper is available at

DOI: 10.2478/s11696-014-0621-z


Chemical Papers 68 (12) 1767–1773 (2014)

Thursday, August 18, 2022

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